Thetford SC234200 automatic vent for use with cassette toilet holding tanks C234 and C200.

Thetford part number: 2372274

The Thetford automatic vent part consists of the following part numbers for the holding tank C234

19. A Automatic vent upper
19. B Seal automatic vent
19. C Foam

The same part is used in the C200 holding tank but listed as the following part numbers:

7. Foam
8. Seal automatic vent
9. Upper automatic vent